Build with -std={c=>gnu}++11 language option
Build with -std={c=>gnu}++11 language option

`c++11` is a "strict" mode and compiler doesn't replace calls to
`fork()` and `exec()` with their gcov-friendly versions in strict modes.

xaizek/uncov,xaizek/uncov,xaizek/uncov,xaizek/uncov,xaizek/uncov